Generic Name: Tadalafil Common uses Cialis is used to treat erection difficulties, such as erectile dysfunction (ED). Directions Cialis comes in two different strengths: 10 mg and 20 mg. The normal startup dose for most patients is 10 mg of Cialis at least 30 minutes before sexual activity. If you don't experience results the first time you take Cialis, your doctor may recommend increasing your dose to 20 mg. Remember to follow your doctor's advice exactly. DON'T take more Cialis than what's prescribed to you. If side effects occur or if they become bothersome, talk to your doctor. Precautions Cialis may cause dizziness in some patients. Until you're exactly sure how you'll respond to Cialis, use caution when driving or operating heavy machinery. To minimize your chances of experiencing side effects, avoid drinking grapefruit juice with Cialis. Also, DON'T use Cialis if you're taking medications containing nitrates, have uncontrolled blood pressure, or if you have a history of stroke or heart attack. Possible side effects Like most medications, Cialis might produce some side effects. In clinical testing the most common side effects reported with Cialis were headache, dyspepsia, dizziness, flushing, nasal congestion, back pain, and muscle pain. These side effects were generally mild and weren't severe enough to discontinue treatment. Overdose If overdose of Cialis is suspected, contact your local poison control center or emergency room immediately. Additional information Keep Cialis in a tightly closed container and out of reach of children. Store Cialis at room temperature and away from excess heat and moisture (not in the bathroom). Note The above information is intended to supplement, not substitute for, the expertise and judgment of your physician, or other healthcare professional. It should not be construed to indicate that use of Cialis is safe, appropriate, or effective for you. Consult your health care professional before you buy Cialis (Tadalafil).